Evaluate
\frac{\sqrt{15}}{5}\approx 0.774596669
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\frac{\sqrt{21}\sqrt{35}}{\left(\sqrt{35}\right)^{2}}
Rationalize the denominator of \frac{\sqrt{21}}{\sqrt{35}} by multiplying numerator and denominator by \sqrt{35}.
\frac{\sqrt{21}\sqrt{35}}{35}
The square of \sqrt{35} is 35.
\frac{\sqrt{735}}{35}
To multiply \sqrt{21} and \sqrt{35}, multiply the numbers under the square root.
\frac{7\sqrt{15}}{35}
Factor 735=7^{2}\times 15. Rewrite the square root of the product \sqrt{7^{2}\times 15} as the product of square roots \sqrt{7^{2}}\sqrt{15}. Take the square root of 7^{2}.
\frac{1}{5}\sqrt{15}
Divide 7\sqrt{15} by 35 to get \frac{1}{5}\sqrt{15}.
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